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                    <h1 class="clearfix">
                        <span class="pk-color-title">Array.join()</span>
                        <span class="pk-float-right pk-tip">Core > Object > Array >join</span>
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                        <div class="pk-unit-tag">Description</div>
                        <pre>    join()将数组的每一个元素转换为字符串，并通过在中间插入指定的separator字符串将它们衔接起来，最后返回衔接好的字符串。
    可以进行相反的操作——将字符串分割成数组元素——使用String对象的split()方法即可。</pre>
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                        <span class="pk-color-title pk-italic">参数 array.join([separator])</span>
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                                <th class="pk-w120">参数名</th>
                                <th>描述</th>
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                                <td>separator</td>
                                <td>在返回的字符串中，用来分隔数组的某个元素与下一个元素的可选字符或字符串。如果省略，默认是英文逗号(,)。</td>
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                        <span class="pk-color-title pk-italic">返回值</span>
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                        <div class="pk-unit-tag">Description</div>
                        <pre>一个字符串。将array的每一个元素转化为字符串，然后用separator字符串分隔开，最后衔接为返回的字符串。</pre>
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                        <span class="pk-color-title pk-italic">代码示例</span>
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                            <span>Code</span>
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                        <pre>a = <span class="pk-code-key">new</span> Array(1, 2, 3, "testing");
s = a.join("+"); // s is the string "1+2+3+testing"</pre>
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